Supersymmetry Signatures with High-pT Photons or Long-Lived Heavy Particles

In certain Supersymmetry breaking scenarios, characteristic signatures can be expected which would not necessarily be found in generic SUSY searches for events containing high pT multi-jets and large missing transverse energy. This paper describes the expected response of the ATLAS detector to four signatures: high-pT photons which may or may not appear to point back to the primary collision vertex and long-lived charged sleptons and R hadrons. Such processes often have the advantage of small Standard Model backgrounds and their observation could provide unique constraints on the different SUSY breaking scenarios. Using these signatures discovery potentials are estimated for either Gauge-Mediated Supersymmetry Breaking or Split-Supersymmetry scenarios. Using Monte Carlo samples of SUSY and background processes corresponding to integrated luminosity of about 1 fb^-1 we study all aspects of the analysis, including the expected trigger response and offline data reconstruction.